Ki Mobility Catalyst Folding Modular Wheelchair from Ki Mobility

The “Best-in-Class” K0004 chair on the market today.  With a 24lb weight. This K0004 is easier to push and transport than its competitors.

The Catalyst 4 is our entry-level chair with the lowest base prices available in the Catalyst Family.

The Catalyst 4C has more options available than its sister product the Catalyst 4.


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The Ki Mobility Catalyst 4 & 4C are the lightest, most durable and easiest to use K4 folders on the market.

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The patented frame concept uses intelligent geometry to create a significantly stronger, lighter and better performing chair.
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The Catalyst 4 series axle is mounted 1 ½” forward to traditional axle positions.  This small change can improve efficiency significantly. The simple axle plate design offers vertical adjustments of the axle in five positions.  It can also be reversed to gain greater rearward stability. 
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Ki Mobility proudly offers the Ultra-sleek and lightweight X-Coretm mags.  These wheels have far greater stiffness and rigidity than conventional mags while keeping the weight to only 1 lb. more than spokes. Now available in 20″, 22″ and 24″.
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Enjoy the simplicity and strength of Catalyst’s patented swing-away footrest hangers. The tapered engagement keeps the footrests snug and rattle-free. Comes with a lifetime warranty

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Maxx Performance is our new spoke wheel that offers performance and style without a high price tag. It features eighteen radial spokes and a high flange hub that result in increased rigidity for a more responsive, better performing wheel. The heightened level of responsiveness combined with a lightweight design give the rider the most from every push. Constructed with a 6061 series aluminum rim and straight steel spokes with a durable black satin finish for a look and feel that is anything but standard.

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Frame Options

Hanger Options

Backrest Options







Wheel Locks

Axles and Axle Plates




Pelvic Positioning Belts


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The Catalyst 4 & 4C are the lightest, most durable and easiest to use K4 folders on the market.
Catalyst 4 & 4C both take advantage of all of the “Catalyst Difference” design features to allow you to fit, adjust and ride with confidence.  A defining characteristic of each chair is its axle plate.
Catalyst 4 & 4C offer the option of a swing-away front end featuring our patented footrests or 70° or 80° fixed frames.  The swing-away hangers come in 4 bends (60°, 70°, 80° & 90°) are light and easy to use and so strong we offer a lifetime warranty.

Additional Information

Transport Weight *

16 lbs 7.25 kg * Catalyst 4 & 4C weight calculated based upon: 16”x16” Frame, 5”x1” Poly Casters, Height Adjustable T-Arm Receivers. Footrest and Rear Wheels removed.

Standard Weight

26 lbs. 11.79 kg

Seat Width

14 – 22" 36 – 56 cm

Seat Depth

14 – 20" 36 – 51 cm

Front Seat Height

13.5 – 21" 34 – 53 cm

Rear Seat Height

Catalyst 4 Rear Seat Height 12 – 19" 31 – 48 cm Catalyst 4C Rear Seat Height 12 – 20" 31 – 51 cm

Weight Capacity

Weight Capacity 250 lbs. 113.40 kg Weight Capacity HD 350 lbs. 158.76 kg

Top Frame Tubing Size

1" 2.54 cm

Bottom Frame Tubing Size

1.125" 2.86 cm